GM Service Manual Online
For 1990-2009 cars only

This vehicle is equipped with the Delco DBC7 non-integral Antilock Brake System (ABS). The system employs two valves per channel, 3-channel system to reduce the tendency of any wheel to lock-up. This improves driver control of the vehicle during braking. The purpose of the ABS is to minimize wheel lockup during heavy braking on most road surfaces. The ABS performs this function by monitoring the speed of each wheel and the ABS performs this function by controlling the brake fluid pressure to each wheel independently during a braking maneuver. This allows the driver to retain directional stability and allows the driver better steering capability.

The purpose of the Antilock Brake System (ABS) is to minimize wheel slipping during braking, thus improving vehicle stability and steerability. The ABS accomplishes this objective by controlling the hydraulic pressure applied at each front wheel brake and both rear wheel brakes as a pair.